METHOD FOR FORMING TAPER BODY, AND ROLLING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method capable of forming a taper body excellent in characteristics and quality at a low cost and to provide a rolling device used therefor. SOLUTION: With the rolling device capable of forming and opening of the gap for rolling, a base stock 35a the diameter of the cross section of which is stepwise changed in the axial direction is formed and a taper-shaped manufactured article 35b is formed from this base stock 35a by die forging. Thus, as compared to a case where the manufactured article 35b is formed only by die forging from a base stock the diameter of the cross section of which is uniform in the axial direction, the reduction of volume at the die forging is small and the manufactured article 35b is formed in a short time.